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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,719
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,733
    09-30-2005, 09:44 AM Go to last post
  1. how to prove SSE has n-2 degrees of freedom???

    make use of matrix or?

    Started by dennis_szsy‎, 11-03-2012 07:35 AM
    • Replies: 4
    • Views: 3,895
    11-03-2012, 12:01 PM Go to last post
  2. Just checking

    The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds.What is the minimum weight of...

    Started by lonerider‎, 11-02-2012 09:39 PM
    • Replies: 3
    • Views: 5,541
    11-03-2012, 10:15 AM Go to last post
  3. Exclamation Winsorizing data

    Hi there, I already checked the two other threads about winsorizing, but it didn't solve my problem. I have a dataset for OLS regression and...

    Started by fxen3k‎, 11-03-2012 04:04 AM
    • Replies: 2
    • Views: 9,005
    11-03-2012, 06:07 AM Go to last post
  4. uniform distrubution

    If x is uniformly distributed over the interval 8 to 12, inclusively (8 ≤ x ≤ 12), then the probability, P(13 ≤ x ≤ 15), is 15-13 = 2 12-8 = 4...

    Started by lonerider‎, 11-02-2012 11:20 PM
    • Replies: 1
    • Views: 6,216
    11-02-2012, 11:22 PM Go to last post
  5. Wink Hypothesis Testing

    Hi all, I've got an MCQ question for uni that I'm not sure how to go about :confused:. If anyone could point me in the right direction that would...

    Started by joshua.bitossi‎, 10-16-2012 03:35 AM
    help me!, homework, hypothesis testing
    • Replies: 2
    • Views: 2,880
    11-02-2012, 01:37 PM Go to last post
  6. Best test for my data?

    I've been going in circles trying to figure out the best way to analyze my data. Here goes... I'm studying changes in concentrations of various...

    Started by lab rat‎, 11-01-2012 04:25 PM
    • Replies: 1
    • Views: 1,158
    11-02-2012, 11:56 AM Go to last post
  7. Homogeneity of Regression in 2-Way ANCVOA: How do I test for this in SPSS?

    I need to conduct a Two-Way ANCOVA in SPSS and am confused about how to test for whether or not the homogeneity of regression assumption has been...

    Started by Neophyte‎, 09-27-2012 09:57 PM
    • Replies: 4
    • Views: 6,498
    11-02-2012, 10:54 AM Go to last post
  8. trend spotting

    I am a software engineer with a very limited statistics background but the standard engineering math background. While in grad school I did some work...

    Started by j2cunningham‎, 11-02-2012 10:21 AM
    • Replies: 1
    • Views: 2,452
    11-02-2012, 10:48 AM Go to last post
  9. [Stata] Selecting duplicate rows based on maximum column value

    Hi all, I'm currently working on my master thesis, and am trying to select data from a company database. However, in this database sometimes a...

    Started by Vugt‎, 11-02-2012 10:46 AM
    • Replies: 0
    • Views: 1,680
    11-02-2012, 10:46 AM Go to last post
  10. Standard deviations related question...help?

    Q. A school social worker is determining eligibility for anxiety management groups at a high school she is employed at. If she is interested in...

    Started by crisb_2002‎, 11-01-2012 08:50 PM
    homework, mean standard deviation, standard deviation, statistics
    • Replies: 3
    • Views: 1,901
    11-02-2012, 08:50 AM Go to last post
  11. Can rolling r-square give a general idea of profitibility trends?

    Hello, all. Iím new to statistics and was wondering if anybody can help with a problem thatís been on my mind. Iím interested in analyzing...

    Started by bandit7x‎, 11-02-2012 08:14 AM
    • Replies: 0
    • Views: 1,514
    11-02-2012, 08:14 AM Go to last post
  12. Finding probability from distribution of sample means.

    A major supermarket regularly receives batches of bottles of lemon juice from The Juice Factory.The supermarket will reject an entire batch if a...

    Started by J.Feki‎, 11-02-2012 02:05 AM
    • Replies: 0
    • Views: 1,338
    11-02-2012, 02:05 AM Go to last post
  13. question

    In calculating power, what is the difference between n1 ! = n2 and n1 = n2? What does this mean? Can anyone clarify this?

    Started by bgaynes‎, 11-01-2012 04:31 PM
    • Replies: 3
    • Views: 2,600
    11-01-2012, 06:34 PM Go to last post
  14. Bias Correction

    I'm working with a dataset consisting of just over 2 years of 5 minute data. For roughly 7 months of this time my instrument was not functioning...

    Started by Dan1234‎, 11-01-2012 04:44 PM
    • Replies: 2
    • Views: 1,220
    11-01-2012, 05:20 PM Go to last post
  15. Determining value in a wager using predicted win totals?

    I offered to help someone out with calculating this and now realize I may have stepped in way over my head. He had calculated projected win totals...

    Started by tto827‎, 11-01-2012 04:42 PM
    • Replies: 0
    • Views: 893
    11-01-2012, 04:42 PM Go to last post
  16. Understanding ln in equation

    Hey guys. So, I've been relying heavily on STATA for my statistical work (I'm a social scientist) so my mathematics is rusty. I have found an...

    Started by starpen‎, 11-01-2012 02:56 PM
    • Replies: 2
    • Views: 2,158
    11-01-2012, 04:40 PM Go to last post
  17. r squared and f statistic comparison

    I have carried out simple linear regression on a number of variables both continuous and categorical (using dummy variables) individually in SPSS. I...

    Started by Nosil‎, 11-01-2012 01:28 PM
    • Replies: 0
    • Views: 3,658
    11-01-2012, 01:28 PM Go to last post
  18. Regression

    Hello, Why when regressing future home price change onto the expected change, under traditional Rational expectations theory, the constant should...

    Started by GIS‎, 11-01-2012 07:27 AM
    • Replies: 2
    • Views: 2,424
    11-01-2012, 08:53 AM Go to last post
  19. How to interpret test result with different p values?

    I am doing an analysis to test whether the observed kurtosis is significantly different from expected kurtosis of a normal distribution. I have...

    Started by hianghao‎, 11-01-2012 06:02 AM
    • Replies: 0
    • Views: 1,564
    11-01-2012, 06:02 AM Go to last post
  20. Multivariate equivalent of a matched pairs t-test?

    Hi there, I have a multivariate data set, and I have performed the main analyses on it and am happy with the results. Now, I took duplicate...

    Started by biologynerd‎, 10-31-2012 10:24 PM
    matched pairs, multivariate, primer-e
    • Replies: 3
    • Views: 2,158
    11-01-2012, 05:49 AM Go to last post
  21. Who will win the electoral college?

    There are 8 toss up states. The distribution of electoral votes of those states are: 29 18 13 10 9 6 6 4 One candidate requires 33 electoral...

    Started by mm427‎, 10-31-2012 07:56 PM
    election, probability, statistics
    • Replies: 5
    • Views: 1,926
    10-31-2012, 10:18 PM Go to last post
  22. Confusing Sampling Distribution Problem

    Ok, I was understanding how to work sampling distribution problems until I came to this one, and I cannot figure out how to do it for the life of me:...

    Started by MustainSally‎, 10-30-2012 11:35 PM
    probability, r code, sampling distribution
    • Replies: 9
    • Views: 5,163
    10-31-2012, 09:20 PM Go to last post
  23. which test could I take?

    Hello, I am new here and also I am quite new to statistics and guess I lack very basic things. I hope to get some input here. Let's see ;-) I...

    Started by Tagmarie‎, 10-31-2012 10:47 AM
    • Replies: 1
    • Views: 1,330
    10-31-2012, 11:45 AM Go to last post
  24. when will Maximum Likelihood Estimation be same as sample mean

    hi guys as above, is there a case when mle will be = to sample mean? If yes when? thanks!

    Started by mamypokozang‎, 10-31-2012 06:38 AM
    • Replies: 1
    • Views: 1,598
    10-31-2012, 09:05 AM Go to last post
  25. urgent help needed please!! Left vs right vs two tail Fisher's Exact test

    Dear all, I have an urgent though probably little question and it would be great if you could help me out! (It is for a friend who has to finish...

    Started by KathiF‎, 10-26-2012 09:48 AM
    • Replies: 3
    • Views: 3,250
    10-31-2012, 07:10 AM Go to last post
  26. Maximum Likelihood Estimate for Normal Distribution unknown Mean,known variance

    If (x_1, ..., x_n) is a sample from N (\mu, 1), where \mu >= 0 and is unknown, determine the MLE of \mu I can easily compute the MLE for mu when...

    Started by simplemts‎, 10-30-2012 09:07 PM
    • Replies: 2
    • Views: 3,486
    10-30-2012, 11:24 PM Go to last post
  27. Rate per 100,000 persons for a financial quarter - divide annual population by 4?

    Hello, How do I calculate the rate per 100,000 persons of something occurring for a quarter of a year? Specifically, If I have a count of...

    Started by kwak123‎, 10-30-2012 10:53 PM
    • Replies: 0
    • Views: 1,984
    10-30-2012, 10:53 PM Go to last post
  28. Finding a PDF using the CDF technique

    Hey guys, I'm stuck on a question in my homework assignment and I was wondering if you could push me in the right direction? So here's the question:...

    Started by EyhSteve‎, 10-30-2012 08:21 PM
    cdf, cdf technique
    • Replies: 0
    • Views: 2,228
    10-30-2012, 08:21 PM Go to last post
  29. Sampling distribution

    Hi, I have to calculate mean and standard deviation of sample means of size 30 (with replacement) from a population of size 87. Its impossible to...

    Started by alikhan44‎, 10-30-2012 06:39 PM
    large data sampling, sampling distribution, sampling with replacement, simple random sample
    • Replies: 0
    • Views: 1,219
    10-30-2012, 06:39 PM Go to last post
  30. Correlation between normal and exponential

    Can anybody give me some pointers to how to compute confidence intervals for Pearson correlation in the case (X,Y) where X is normal and Y is...

    Started by mjastrzab‎, 10-30-2012 05:35 PM
    correlation analysis, exponential distribution, normal distribution
    • Replies: 0
    • Views: 700
    10-30-2012, 05:35 PM Go to last post
  31. Using loess smoothing with different kinds of predictors

    Hey guys, Just throwing this out there in case anyone is familiar. Lets say I have three types of variables: continuous, categorical, and...

    Started by Link‎, 10-30-2012 04:54 PM
    • Replies: 0
    • Views: 965
    10-30-2012, 04:54 PM Go to last post
  32. Help with the Continuous Distribution Function (CDF)?

    Hey, new to these forums, I was wondering if you guy could help me with a question about the CDF I have. Basically I'm wondering if this CDF: ...

    Started by EyhSteve‎, 10-30-2012 01:07 PM
    cdf
    • Replies: 2
    • Views: 1,133
    10-30-2012, 03:41 PM Go to last post
  33. Rampaging somethings in the something something system

    i am strugling with the following question i cant seem to get my head around it....the standard deviation of the the masses of 800 blocks is 252kg. A...

    Started by a.j‎, 10-30-2012 02:12 PM
    • Replies: 0
    • Views: 1,192
    10-30-2012, 02:12 PM Go to last post
  34. AMOS - fit indices for nonnormal data

    Dear all, I've am struggling on a CFA in AMOS conducted on multivariate nonnormal data. I want to identify the factorial structure that best...

    Started by Daea‎, 10-29-2012 06:23 PM
    • Replies: 3
    • Views: 8,942
    10-30-2012, 08:04 AM Go to last post
  35. How are the correlation coefficient and regression line coefficients related?

    For a given r value, say r=0.8: for the regression line equation y=mx+b a) given the value of the slope (m) in the regression line, can the...

    Started by mathprof‎, 10-29-2012 08:24 PM
    correlation regression
    • Replies: 2
    • Views: 1,543
    10-29-2012, 08:50 PM Go to last post
  36. Statistics- Probability Help

    I am not sure if I am using the normal unit table correctly. I have already done the work, but I don't know which probability is correct. I am not...

    Started by brino711‎, 10-29-2012 04:08 PM
    • Replies: 1
    • Views: 3,512
    10-29-2012, 08:29 PM Go to last post
  37. Significant results without significant correlation

    Hi, I have a weird case - I am finding significant effect (in a regression) for a variable where there is no significant correlation between them....

    Started by underworld‎, 10-29-2012 06:07 PM
    correlation, regression, significant
    • Replies: 3
    • Views: 1,719
    10-29-2012, 08:12 PM Go to last post
  38. help with point estimate my attempt follows the question

    A marketing research company is estimating which of two soft drinks college students prefer. A random sample of n college students produced the...

    Started by jennifer‎, 10-29-2012 06:47 PM
    • Replies: 0
    • Views: 3,148
    10-29-2012, 06:47 PM Go to last post
  39. Confidence interval from st. error when the mean must be positive

    Hello all, (Statistical newbie here - learning some basic concepts) Some background (you can probably skip to the 'important bit', but just in...

    Started by aferraro‎, 10-23-2012 10:21 AM
    • Replies: 6
    • Views: 1,725
    10-29-2012, 04:59 PM Go to last post
  40. Mixed ANOVA: p-Value of within factor increases by adding a between factor...?

    Hello, I thought I'm good in math and statistics but this one is giving me a real headache...hope one of the pros here can explain/solve it... ...

    Started by Marc_Berlin1‎, 10-24-2012 09:47 PM
    f-value, mixed anova, p-value, spss output
    • Replies: 1
    • Views: 2,443
    10-29-2012, 02:43 PM Go to last post
  41. The concept behind finding probabilities beyond a 3.4 z score positive or negative

    I could really use some assistance. I am taking a stats course for an mba and need to understand the concept behind finding probability for z scores...

    Started by Statschallenged2006‎, 10-29-2012 08:32 AM
    beyond a z scores of 3.4
    • Replies: 5
    • Views: 17,869
    10-29-2012, 11:56 AM Go to last post
  42. Please help "test for ranks"

    Dear All, Please help. I am interested to find out if there is any significant difference in the ranks obtained from 3 methods. for example...

    Started by ompra‎, 10-20-2012 04:25 AM
    • Replies: 2
    • Views: 1,893
    10-29-2012, 10:58 AM Go to last post
  43. multinomial conditional distribution

    Hey guys, I'm hoping that one of you can help me out. I'm stuck on a problem. Suppose X = (X_1, ..., X_k) follows a multinomial distribution...

    Started by Link‎, 10-28-2012 01:21 PM
    • Replies: 3
    • Views: 3,241
    10-29-2012, 10:38 AM Go to last post
  44. Additivity of sums of squares in ANOVA

    Hello-i have a question (not a homework...but more logical one) For balanced design (where there are equal number of observation in each row/column)...

    Started by nyo‎, 10-29-2012 12:04 AM
    • Replies: 1
    • Views: 1,722
    10-29-2012, 08:56 AM Go to last post
  45. Confidence interval, does a difference in sample size affect comparison of results?

    I have a time series and im trying to calculate the confidence interval (95%) for the time taken to experience a +ive or -ive move of X%. I would...

    Started by Hans Rudel‎, 10-29-2012 04:26 AM
    confidence interval
    • Replies: 1
    • Views: 1,934
    10-29-2012, 07:39 AM Go to last post
  46. How do I show that the Cp statistic, adjusted R, R, and F all give the same rankings?

    For a given number of predictors, how can I show that the R^2, adjusted R^2, Cp, and F statistic have the same ranking? I at first thought to make...

    Started by gameomega‎, 10-29-2012 02:15 AM
    • Replies: 0
    • Views: 1,067
    10-29-2012, 02:15 AM Go to last post
  47. Method of Moments and Maximum Likelihood Estimator--- Negative Binomial Distribution

    Are the Method of Moments ("MOM") and the Maximum Likelihood Estimator ("MLE") the same for a Negative Binomial Distribution with a sample space of...

    Started by simplemts‎, 10-29-2012 12:26 AM
    • Replies: 0
    • Views: 4,597
    10-29-2012, 12:26 AM Go to last post
  48. Please help!

    I cannot figure this question out for the life of me :( A game consists of tossing two coins, first a dime and then a nickel. For each coin which...

    Started by klsybrns‎, 10-28-2012 08:12 PM
    help needed, help please, help statistics question, probabilty, statistics
    • Replies: 0
    • Views: 1,518
    10-28-2012, 08:12 PM Go to last post
  49. The probability of x bar being a certain value (different from E[X] and not normal)

    I'm pulling my hair out with this question. It isn't in my notes, my text or in anything I can find online. I'm not sure if I'm having a massive...

    Started by imdulek‎, 10-28-2012 05:08 PM
    • Replies: 2
    • Views: 2,953
    10-28-2012, 05:55 PM Go to last post
  50. Single Correlation coefficient between multiple datarows

    Hi, ... and apologies for this probably stupid question - I used to be good at Statistics ages ago but you know how it is if you do not apply stuff...

    Started by randomrun‎, 10-28-2012 03:21 PM
    • Replies: 0
    • Views: 1,257
    10-28-2012, 03:21 PM Go to last post
  51. Help! Which test do I use and how?! *very rusty graduate*

    Hi all I have been given some data and I need to do some significance testing on it. The data revolves around food types. Firstly I have been...

    Started by statsman1‎, 10-25-2012 03:37 PM
    hypotheis test, significance testing, t-tests, test data, testing
    • Replies: 2
    • Views: 1,252
    10-28-2012, 09:39 AM Go to last post
  52. Calculating True Score Given Reliability and Total Variance

    I've got a question about estimating a true score variance. I'm given the following info: a test contains 20 items, an individual's score was 80,...

    Started by tk6‎, 10-28-2012 12:25 AM
    • Replies: 0
    • Views: 7,182
    10-28-2012, 12:25 AM Go to last post
  53. Null hypothesis testing Help please!

    A hypothesis test is done to determine whether the mean length of time a rose stays fresh and alive , after given as a gift, is different than 4.5...

    Started by Nellen2222‎, 10-28-2012 12:10 AM
    • Replies: 0
    • Views: 1,414
    10-28-2012, 12:10 AM Go to last post
  54. Population

    How does one find the population in a study?

    Started by somethingclever‎, 10-27-2012 07:13 PM
    • Replies: 5
    • Views: 1,713
    10-27-2012, 10:58 PM Go to last post
  55. confidence interval

    I have no clue how to answer this: Suppose 100 randomly selected members of Facebook were asked how much time they spend on the site during the...

    Started by somethingclever‎, 10-27-2012 07:09 PM
    • Replies: 1
    • Views: 2,091
    10-27-2012, 09:38 PM Go to last post
  56. maximum likelihood of 1+(a/b)cos (theta)

    Hello everyone. I am stuck in a problem which is the following. I will explain my problem, then my attempt. The idea is to evaluate an estimator...

    Started by statwiz‎, 10-26-2012 11:57 AM
    • Replies: 6
    • Views: 2,597
    10-26-2012, 05:24 PM Go to last post
  57. does anyone know the name of this theorem?

    Hello, I have read in a book that when we take multiple times measures of a same quantity and that we get different values and variances for those...

    Started by statwiz‎, 10-26-2012 05:01 PM
    • Replies: 0
    • Views: 1,125
    10-26-2012, 05:01 PM Go to last post
  58. Does paired t test need normality of differences?

    Hello everyone, I am currently studying statistics so please be patient as my first post is at a quite basic level. I am trying to carry out a...

    Started by MVCastleQueen‎, 10-26-2012 10:21 AM
    • Replies: 1
    • Views: 2,341
    10-26-2012, 11:48 AM Go to last post
  59. which method do I have to use??

    hi I have 3 dependent and correlate variables and 4 independent my sample is coming from sports, and I want to check if and how my indep.variable...

    Started by katerina‎, 10-26-2012 05:11 AM
    • Replies: 1
    • Views: 1,030
    10-26-2012, 07:48 AM Go to last post
  60. Two Central Limit Theorem problems [ I have the answers just need help understanding]

    1) Acording to AAA the average daily meal and loading cost for a family of four is 213. Assume that the standard devation of such cost is 15....

    Started by esmile‎, 10-24-2012 09:18 PM
    • Replies: 1
    • Views: 1,245
    10-26-2012, 02:32 AM Go to last post

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